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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
Systolic and Diastolic Blood Pressure. When your blood pressure is measured, you get two different numbers. These numbers represent the systolic blood pressure and the diastolic blood pressure. Both numbers reflect the pressure exerted by the blood flowing within your arteries.